| Main Ref. | Herre, A.W.C.T., 1924 |
| Appearance refers to | |
| Bones in OsteoBase |
| Specialized organs | |
| Different appearance | |
| Different colors | |
| Remarks |
| Striking features | none |
| Body shape lateral | short and / or deep |
| Cross section | compressed |
| Dorsal head profile | clearly convex |
| Type of eyes | more or less normal |
| Type of mouth/snout | more or less normal |
| Position of mouth | terminal |
| Type of scales | |
| Diagnosis |
Specimens dusky above, pale or pale-yellowish sides and belly; opercle and preopercle silvery; scales outlined by dark dots. Head naked; mouth large, oblique; upper thin lip slightly protractile with a median notch into which fits a small knob on tip of lower lip. Pectoral pointed, tip extending beyond origin of small ventrals; caudal slightly longer than head with the lower lobe larger. Belly with a sharp, cutting edge. Barbels shorter than head; number of anal fin rays smaller than N. everetti and N. steindachneri. 22-23 scales from nape to dorsal. |
| Ease of Identification |
| Lateral Lines | 1 Interrupted: No |
| Scales on lateral line | 34 - 37 |
| Pored lateral line scales | |
| Scales in lateral series | |
| Scale rows above lateral line | 5.5 - 7.5 |
| Scale rows below lateral line | 1.5 - 1.5 |
| Scales around caudal peduncle | 12 - 14 |
| Barbels | 0 |
| Gill clefts (sharks/rays only) | |
| Gill rakers | |
| on lower limb | |
| on upper limb | |
| total | |
| Vertebrae | |
| preanal | |
| total |
| Attributes | no striking attributes |
| Fins number | 1 |
| Finlets No. | Dorsal |
| Ventral | |
| Spines total | 2 - 2 |
| Soft-rays total | 8 - 9 |
| Adipose fin | absent |
| Attributes | forked; more or less normal |
| Fins number | 1 |
| Spines total | 3 - 3 |
| Soft-rays total | 12 - 14 |
| Pectoral | Attributes more or less normal |
| Spines 1 | |
| Soft-rays 11 - 12 | |
| Pelvics | Attributes more or less normal |
| Position | |
| Spines 1 | |
| Soft-rays 6 - 5 |